SPI Communication mode between Arduino Ethernet and EVAL-ADAU1701MINIZ

Projects Networking, Protocols, and Devices
2

I'm not sure why the MOSI and CS resistor circuit. Normally those would be a direct connection.

If you are trying to communicate with the ADAU1701, why are you toggling the w5100 CS line? That is D10 (ETHCS). Which Arduino pin is the ADAU1701 CS line? Is that D9? If so, you should be using that instead of D10 (ETHCS).